mirror of
https://github.com/aquasecurity/kube-bench.git
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310 lines
12 KiB
YAML
310 lines
12 KiB
YAML
---
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controls:
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version: "gke-1.0"
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id: 4
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text: "Worker Node Security Configuration"
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type: "node"
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groups:
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- id: 4.1
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text: "Worker Node Configuration Files"
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checks:
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- id: 4.1.1
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text: "Ensure that the kubelet service file permissions are set to 644 or more restrictive (Not Scored)"
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type: skip
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remediation: "This control cannot be modified in GKE."
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scored: false
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- id: 4.1.2
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text: "Ensure that the kubelet service file ownership is set to root:root (Not Scored)"
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type: skip
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remediation: "This control cannot be modified in GKE."
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scored: false
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- id: 4.1.3
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text: "Ensure that the proxy kubeconfig file permissions are set to 644 or more restrictive (Scored)"
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audit: '/bin/sh -c ''if test -e $proxykubeconfig; then stat -c permissions=%a $proxykubeconfig; fi'' '
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tests:
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test_items:
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- flag: "permissions"
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compare:
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op: bitmask
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value: "644"
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remediation: |
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Run the below command (based on the file location on your system) on each worker node.
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For example,
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chmod 644 $proxykubeconfig
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scored: true
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- id: 4.1.4
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text: "Ensure that the proxy kubeconfig file ownership is set to root:root (Scored)"
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audit: '/bin/sh -c ''if test -e $proxykubeconfig; then stat -c %U:%G $proxykubeconfig; fi'' '
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tests:
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test_items:
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- flag: root:root
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remediation: |
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Run the below command (based on the file location on your system) on each worker node.
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For example, chown root:root $proxykubeconfig
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scored: true
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- id: 4.1.5
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text: "Ensure that the kubelet.conf file permissions are set to 644 or more restrictive (Not Scored)"
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type: skip
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remediation: "This control cannot be modified in GKE."
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scored: false
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- id: 4.1.6
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text: "Ensure that the kubelet.conf file ownership is set to root:root (Not Scored)"
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type: skip
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remediation: "This control cannot be modified in GKE."
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scored: false
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- id: 4.1.7
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text: "Ensure that the certificate authorities file permissions are set to 644 or more restrictive (Not Scored)"
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type: skip
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remediation: "This control cannot be modified in GKE."
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scored: false
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- id: 4.1.8
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text: "Ensure that the client certificate authorities file ownership is set to root:root (Not Scored)"
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type: skip
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remediation: "This control cannot be modified in GKE."
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scored: false
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- id: 4.1.9
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text: "Ensure that the kubelet configuration file has permissions set to 644 or more restrictive (Scored)"
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audit: '/bin/sh -c ''if test -e $kubeletconf; then stat -c permissions=%a $kubeletconf; fi'' '
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tests:
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test_items:
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- flag: "permissions"
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set: true
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compare:
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op: bitmask
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value: "644"
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remediation: |
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Run the following command (using the config file location identified in the Audit step)
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chmod 644 $kubeletconf
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scored: true
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- id: 4.1.10
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text: "Ensure that the kubelet configuration file ownership is set to root:root (Scored)"
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audit: '/bin/sh -c ''if test -e $kubeletconf; then stat -c %U:%G $kubeletconf; fi'' '
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tests:
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test_items:
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- flag: root:root
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remediation: |
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Run the following command (using the config file location identified in the Audit step)
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chown root:root $kubeletconf
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scored: true
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- id: 4.2
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text: "Kubelet"
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checks:
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- id: 4.2.1
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text: "Ensure that the --anonymous-auth argument is set to false (Scored)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: "--anonymous-auth"
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path: '{.authentication.anonymous.enabled}'
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compare:
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op: eq
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value: false
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remediation: |
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If using a Kubelet config file, edit the file to set authentication: anonymous: enabled to
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false.
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If using executable arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
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--anonymous-auth=false
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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- id: 4.2.2
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text: "Ensure that the --authorization-mode argument is not set to AlwaysAllow (Scored)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --authorization-mode
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path: '{.authorization.mode}'
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compare:
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op: nothave
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value: AlwaysAllow
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remediation: |
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If using a Kubelet config file, edit the file to set authorization: mode to Webhook. If
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using executable arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_AUTHZ_ARGS variable.
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--authorization-mode=Webhook
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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- id: 4.2.3
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text: "Ensure that the --client-ca-file argument is set as appropriate (Scored)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --client-ca-file
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path: '{.authentication.x509.clientCAFile}'
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set: true
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remediation: |
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If using a Kubelet config file, edit the file to set authentication: x509: clientCAFile to
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the location of the client CA file.
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If using command line arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_AUTHZ_ARGS variable.
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--client-ca-file=<path/to/client-ca-file>
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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- id: 4.2.4
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text: "Ensure that the --read-only-port argument is set to 0 (Scored)"
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type: skip
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remediation: "This control cannot be modified in GKE."
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scored: true
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- id: 4.2.5
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text: "Ensure that the --streaming-connection-idle-timeout argument is not set to 0 (Scored)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --streaming-connection-idle-timeout
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path: '{.streamingConnectionIdleTimeout}'
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compare:
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op: noteq
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value: 0
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- flag: --streaming-connection-idle-timeout
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path: '{.streamingConnectionIdleTimeout}'
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set: false
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bin_op: or
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remediation: |
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If using a Kubelet config file, edit the file to set streamingConnectionIdleTimeout to a
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value other than 0.
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If using command line arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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set the below parameter in KUBELET_SYSTEM_PODS_ARGS variable.
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--streaming-connection-idle-timeout=5m
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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- id: 4.2.6
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text: "Ensure that the --protect-kernel-defaults argument is set to true (Scored)"
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type: skip
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remediation: "This control cannot be modified in GKE."
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- id: 4.2.7
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text: "Ensure that the --make-iptables-util-chains argument is set to true (Scored) "
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --make-iptables-util-chains
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path: '{.makeIPTablesUtilChains}'
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compare:
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op: eq
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value: true
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- flag: --make-iptables-util-chains
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path: '{.makeIPTablesUtilChains}'
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set: false
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bin_op: or
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remediation: |
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If using a Kubelet config file, edit the file to set makeIPTablesUtilChains: true.
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If using command line arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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remove the --make-iptables-util-chains argument from the
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KUBELET_SYSTEM_PODS_ARGS variable.
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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- id: 4.2.8
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text: "Ensure that the --hostname-override argument is not set (Scored)"
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audit: "/bin/ps -fC $kubeletbin "
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tests:
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test_items:
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- flag: --hostname-override
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set: false
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remediation: |
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Edit the kubelet service file $kubeletsvc
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on each worker node and remove the --hostname-override argument from the
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KUBELET_SYSTEM_PODS_ARGS variable.
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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- id: 4.2.9
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text: "Ensure that the --event-qps argument is set to 0 or a level which ensures appropriate event capture (Scored)"
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type: skip
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remediation: "This control cannot be modified in GKE."
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- id: 4.2.10
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text: "Ensure that the --tls-cert-file and --tls-private-key-file arguments are set as appropriate (Scored)"
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type: skip
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remediation: "This control cannot be modified in GKE."
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- id: 4.2.11
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text: "Ensure that the --rotate-certificates argument is not set to false (Scored)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: --rotate-certificates
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path: '{.rotateCertificates}'
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compare:
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op: eq
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value: true
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- flag: --rotate-certificates
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path: '{.rotateCertificates}'
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set: false
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bin_op: or
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remediation: |
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If using a Kubelet config file, edit the file to add the line rotateCertificates: true or
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remove it altogether to use the default value.
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If using command line arguments, edit the kubelet service file
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$kubeletsvc on each worker node and
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remove --rotate-certificates=false argument from the KUBELET_CERTIFICATE_ARGS
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variable.
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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- id: 4.2.12
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text: "Ensure that the RotateKubeletServerCertificate argument is set to true (Scored)"
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audit: "/bin/ps -fC $kubeletbin"
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audit_config: "/bin/cat $kubeletconf"
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tests:
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test_items:
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- flag: RotateKubeletServerCertificate
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path: '{.featureGates.RotateKubeletServerCertificate}'
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compare:
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op: eq
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value: true
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remediation: |
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Edit the kubelet service file $kubeletsvc
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on each worker node and set the below parameter in KUBELET_CERTIFICATE_ARGS variable.
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--feature-gates=RotateKubeletServerCertificate=true
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Based on your system, restart the kubelet service. For example:
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systemctl daemon-reload
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systemctl restart kubelet.service
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scored: true
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- id: 4.2.13
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text: "Ensure that the Kubelet only makes use of Strong Cryptographic Ciphers (Not Scored)"
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type: skip
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remediation: "This control cannot be modified in GKE."
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scored: false
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